| (19) |
 |
|
(11) |
EP 0 344 818 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
10.10.1990 Bulletin 1990/41 |
| (43) |
Date of publication A2: |
|
06.12.1989 Bulletin 1989/49 |
| (22) |
Date of filing: 10.05.1985 |
|
|
| (84) |
Designated Contracting States: |
|
BE DE FR GB IT NL SE |
| (30) |
Priority: |
16.05.1984 GB 8412423
|
| (62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
|
85303329.8 / 0161926 |
| (71) |
Applicant: ALLIED COLLOIDS LIMITED |
|
Bradford,
West Yorkshire BD12 0JZ (GB) |
|
| (72) |
Inventors: |
|
- Dymond, Brian
Bradford
West Yorkshire (GB)
- Langley, John
Shipley
West Yorkshire (GB)
- Hawe, Malcolm
Huddersfield
West Yorkshire (GB)
|
| (74) |
Representative: Lawrence, Peter Robin Broughton et al |
|
GILL JENNINGS & EVERY,
Broadgate House,
7 Eldon Street
London EC2M 7LH
London EC2M 7LH (GB) |
|
| |
|
| (54) |
A method of using polymeric compositions |
(57) Water-immiscible liquids, for example oil-based drilling fluids, are thickened by
the addition of a viscosifying polymer in the form of an aqueous emulsion of particles
formed by oil-in-water emulsion. The polymeric particles are water-insoluble, and
insoluble but swellable in the water-immiscible liquid. Preferably, the water-immiscible
liquid is the continuous phase of a dispersion of dry polymer particles or aqueous
polymer gel particles.